产品结构特点：

1、中部无阀盖压力自紧式连结
2、闸板为要楔式弹性单闸板或楔式双闸板结构
3、闸板/阀座双面堆焊钻基硬质合金
4、抗高温蠕变设计
5、阀杆采用渗氮型沉淀硬化不锈钢
6、有手动、齿轮（伞形齿轮和正齿轮）传动、电动

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